Which are the incorrect relationship :

(A) E₁ of H = 1/2 E₂ of He + = 1/3 E₃ of Li2+ = 1/4 E₄ of Be 3+ (B) E₁ (H) = E₂ (He +) = E₃ (Li2+) =E₄ (Be 3+)

(C) E₁ (H) = 2E₂ (He +) = 3E₃ (Li2+) = 4E₄ (Be 3+)

(D) No relation

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Sum of series 2[n/2] ! [n/2]!/ n! [2Co-2C2+3C2....+[-1]^n[n+1]2Cn] where n is an even positive integer. Kindly provide solution of this question and how to generalise this. How do we know that which expansion will give this?